New csf v6.23

Changes:

• Security – added new option RESTRICT_UI. This options restricts the ability to modify settings within csf.conf from the csf UI. Should the parent control panel be compromised, these restricted options could be used to further compromise the server. This option is enabled by default on all installations
• Added entries to csf.pignore on new installations on cPanel servers for Dovecot v2.2 (cPanel v11.40+)
• Fixed UI Template validation error message